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Isolated photons in deep inelastic scattering.

A Gehrmann-De Ridder1, T Gehrmann, E Poulsen

  • 1Institute for Theoretical Physics, ETH, CH-8093 Zürich, Switzerland.

Physical Review Letters
|May 23, 2006
PubMed
Summary
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Large transverse momentum photon production in deep inelastic scattering was measured by the ZEUS experiment. A new parton-level calculation, including fragmentation and large-angle radiation, resolves the discrepancy with theoretical predictions.

Area of Science:

  • High-energy particle physics
  • Quantum chromodynamics
  • Collider physics

Background:

  • Photon radiation at large transverse momenta probes hard interaction dynamics.
  • ZEUS experiment measured isolated photon production cross section in deep inelastic scattering.
  • Discrepancy observed between experimental data and theoretical predictions from standard event generators.

Purpose of the Study:

  • Investigate the discrepancy in isolated photon production cross section.
  • Provide a more accurate theoretical prediction for this observable.

Main Methods:

  • Dedicated parton-level calculation.
  • Inclusion of fragmentation contributions.
  • Inclusion of large-angle radiation contributions.

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Main Results:

  • The parton-level calculation shows good agreement with the ZEUS experimental measurement.
  • The refined theoretical model resolves the previously observed discrepancy.

Conclusions:

  • The detailed parton-level calculation accurately describes isolated photon production.
  • Fragmentation and large-angle radiation are crucial components for understanding this process.